I didn't think about it. Removing the thermostat is not a good idea, as the heat-up using the main circulation (through the radiator) would take much longer. The heater would also be less effective without it.
The PWM control might be useful to shorten the warm-up time, and maybe to free up a fraction of horsepower lowering PWM at WOT momentarily, but not much more. The pump in the car I'm working on consumes only around 7 amps, so almost nothing for the alternator.
The modern cars have thermostats with electric heater integrated in the viscous fluid to vary the opening and closing temperatures some. Anyway, why would you want to cool the car to temperatures lower than thermostat temp?
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